UIImage将图片写入本地相册

UIImageWriteToSavedPhotosAlbum(<#UIImage *image#>, <#id completionTarget#>, <#SEL completionSelector#>, <#void *contextInfo#>)

例子：

UIImage *image = [UIImage imageNamed:@"yintingting"];

UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);